The thing is that I have GoogleTalk plugin, also used for Google+ hangouts, and it works in my netbook, on Ubuntu. But on my laptop, using the same Ubuntu (Oneric) and having used the camera on Cheese so it works, Google+ shows a black screen while trying to use webcam in hangouts.

This is weird, I have installed libv4l-0 and forced GoogleTalkPlugin to preload it. Starting from a console, it shows: